Pipe-wrench.



N 67|,57l Patented Apr. 9, 190|.

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PIPE WRENCH.

(Application -fled July 19, 1900.)

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@Lcd dl i Unitas AMOS YV. WARNOOK, OF BOSTON, MASSACHUSETTS.

PIPE-WRENCH.

' SPECIFICATION forming part of Letters Patent No. 671,571, dated April 9, 1901.

Application led J'uly 19| 1900. Serial No. 24,134. (No model.)

T0 L7/Z whom it may concern,.-

Be it known that I, AMOS W. VVARNOCK, a citizen of the United States, residing in Boston, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Pipe-Wrenches, of which the following is a specification.

This invention has for its object to produce a pipe-wrench which has a good and quick release, in which the jaws will not become locked or jammed upon the workfandcau be opened by a slight movement ofthe handle without being struck by a hammer or other instrument, which can quickly and easily be adapted to larger and smaller pipes, and in which the adjustment cannot be shifted by the side of the wrench coming in contact with any surface.

The nature of the invention is fully described in detail below and illustrated in the accompanying drawings, in which- Figure lis a side elevation of a pipe-wrench embodying my invention, the parts being in normal or operative position. Fig. 2 is an enlarged plan view of the same with the handle broken oit. Fig. 3 is a longitudinal vertical section showingr a pipe in position in the jaws.

Similar letters of reference indicate corresponding parts.

A represents a bar provided with a suitable handle a. This bar is thickened at A, and its front portion A constitutes the stationary jaw of the wrench. The lower edge of. this jaw extends down, as shown, at substantially an obtuse angle with the lower edge of the bar A, and the front edge c is at substantially right angles with the lower edge b, and hence at an obtuse angle with the lower edge of the bar. This edge c is suitably notched or serrated, as shown. Ears B extend up from the stationary jaw, said ears, stationary jaw, and bar being in one integral piece. These ears are sufliciently high to accommodate between them the shank or bar O, the forward end of which is thickened into the movable jaw C', extending downward, as shown,A and formed with tlie inner serrated edge CZ. The shank of this movable jaw is not directly secured in any manner to the stationary jaw and is adapted to slide therein until the horizontal pin D comes in contact with the ears B. The

upper surface of the shank O is provided with suitable forwardly-projecting teeth E. Mounted in the ears near their upper ends is a pivot-pin F, which extends through the pawl H. The rear end of this pawl is held normally in engagement with the teeth E by the bolt K, the lower end of which is held down upon the upper end of the forward por- -tion of the shank O by a spring K', said bolt and spring being in the recess K in the head H of the pawl. The movable jaw O is held at a proper angle and against the pipe S, being operated upon by the bolt L, which is held against the under side of the shank O by the spring L', said bolt and spring being in the recess L" in the bar A.

To contract the wrench for the purpose of applying it to a small pipe, the movable jaw is pushed in, the shank O slipping rearward between the ears B and under the pawl l-I. To expand the wrench in order to apply it to a larger pipe, the rear end of the shank C is pressed down by the thumb of one hand and the head H of the pawl with the thumb of the other hand, thus disengaging the pawl from the teeth E, and the shank O is then slid forward by the thumb which depressed it. The jaws may be then applied to the pipe and the movable jaw Ol pushed back against it. The wrench is then free to operate the pipe. To disengage the wrench from the pipe, the shank 'A is swung up into the position indicated by dotted lines in Fig. 3, and the pipe is released without the aid of a blow from a hammer, as is often necessary with ordinary wrenches, which become jammed on a pipe, and thus locked in position. This swinging upward of the stationary jaw is rendered possible by the high location of the pivot F, whereby a considerable movement of the stationary jaw is provided for.

inasmuch as there is no nut which projects beyond the sides of the wrench, it is evident that there is no danger of the adjustin ent becoming shifted,which frequently happens by reason of the nut coming in contact with a surface near which the side of the wrench is working.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, isy 1. The herein-described improved pipe- IOO wrench, comprising the bar A and stationary jaw A integral with said bar and extending downward at an obtuse angle therewith; the movable jaw C and shank C integral therewith and provided With teeth on its upper surface; the pawl H pivotally connected with the stationary jaw; and mechanisms intermediate respectively the pawl and the shank 'of the movable jaw, and the shank of the movable jaw and the stationary jaw, whereby said pawl is held in engagement with the teeth on said shank, substantiall;7 as described.

2. The herein-described improved pipewrench, comprising the bar A, and stationary jaw A', the latter formed with the serrated engaging surface c set at an obtuse angle AMos w. wARNooK.

Witnesses:

HENRY W. WILLIAMS, E. B. SMALL. 

